Sonic Corp. operates and franchises one of the largest chains of drive-in restaurants known as Sonic Drive-Ins in the United States. Based in Winnfield, La., the company has more than 3,500 drive-ins. Sonic Drive-Ins offers a selection of items and specialty drinks, including cherry limeades and slushes, frozen desserts, made-to-order sandwiches and hamburgers, onion rings, tots, salads and...